A modern approach to building tabbed interfaces using only HTML and CSS, leveraging the <details> element combined with CSS Grid and Subgrid. The tutorial walks through creating a three-column tab layout where each tab is a <details> element positioned using subgrid, with tab panels displayed in a second grid row. The solution uses the ::details-content pseudo-element for styling panel content and CSS custom properties for positioning tabs dynamically. The <details> element provides built-in accessibility features including keyboard navigation and screen reader support.
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